The “Brokeback Mountain” star was linked to Yellin last spring, following her break-up from Jason Segel in February, but after less than a year of dating, the couple is said to have called it a day, a source tells Usmagazine.com.

The pair first sparked dating rumors after last year’s Costume Institute Gala when they were spotted leaving an after party hand-in-hand. However, Williams walked the red carpet solo at last week’s bash at the Metropolitan Museum of Art in New York.